Title:
WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2017/212709
Kind Code:
A1
Abstract:
In order to achieve both actuator responsiveness to operation and front control functionality, provided is a work machine equipped with a front control device that calculates a limit command value for limiting operation of a front work device by controlling a proportional solenoid valve 61b etc. disposed on a pilot line 51b1 etc., wherein the work machine comprises: a bypass line 81B etc. that bypasses the proportional solenoid valve 61b etc. on the pilot line 51b1 etc.; a bypass valve 81b etc. disposed on the bypass line 81B etc.; a switch that outputs a signal for turning control of the front control device ON/OFF; an ON/OFF determination device that determines whether the signal from the switch is an ON signal for turning front control ON or an OFF signal for turning front control OFF; an open/close command device that generates an open command signal for opening the bypass valve when it is determined that the signal is an OFF signal and that generates a close command signal for closing the bypass valve when it is determined that the signal is an ON signal; and an output device that outputs the open command signal or close command signal to the bypass valve.
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Inventors:
TAKEUCHI HIROKI (JP)
ISHIKAWA KOUJI (JP)
IZUMI SHIHO (JP)
MEGURIYA SHUUICHI (JP)
AKITA TAROU (JP)
ISHIKAWA KOUJI (JP)
IZUMI SHIHO (JP)
MEGURIYA SHUUICHI (JP)
AKITA TAROU (JP)
Application Number:
PCT/JP2017/008369
Publication Date:
December 14, 2017
Filing Date:
March 02, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
E02F9/20; E02F3/43; F15B11/04; F15B11/08; F15B11/16
Foreign References:
| JP3091667B2 | 2000-09-25 | |||
| JP2016003442A | 2016-01-12 | |||
| JP2010190368A | 2010-09-02 | |||
| JPH0771051A | 1995-03-14 | |||
| JPH08500418A | 1996-01-16 |
Other References:
See also references of EP 3470582A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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